Range and Stopping Powers

Stopping-Power and Range Tables for Electrons, Protons, and Helium Ions: A NIST resource for stopping powers.
James Ziegler - SRIM & TRIMStopping powers and program TRIM for Monte Carlo calculation of the passag of ions through materials.

Photon Absorption Coefficients

NIST XCOM: Photon Cross Sections Database This is a web based calculation of the photon absorption coefficient and all of the components from 1 eV to 2 GeV.
Mucal: A X-ray calculation available on the web and for download of the program

Nuclear Structure

The Isotope Explorer NSR Server - LBNL-Lund collaboration: A differnet method for searching through the Nuclear Structure References (NSR) and Evaluated Nuclear Structure data bases.
NuDat 2.1 : An Interactive Chart of the Nuclides
Nuclear Information A = 3-20: Triangle Universities Nuclear Laboratory's Nuclear Data Evaluation site has the original reference information for A = 3-20 as well as plots of the level scheme.

Nuclear Reaction Data and Information Centers

T-2 Nuclear Information ServiceThey work on nuclear modeling, nuclear data, cross sections, nuclear masses, ENDF, NJOY data processing, nuclear astrophysics, radioactivity, radiation shielding, data for medical radiotherapy, data for high-energy accelerator applications, data and codes for fission and fusion systems, and more.
barnNational Nuclear Data Center Main U.S. Data Center with links to many interesting sites.
International Atomic Energy Agency Nuclear Data Center IAEA's Nuclear Data Center. ( also International Workshop postings.)
National Energy Agency (France) International collaboration site on nuclear safety and nuclear data.
JAERI Japan Atomic Energy Research Institute This is the site of the Japanese Evaluated Nuclear Data Library (JENDL)

Isotopes

Office of Nuclear Energy, Science and Technology Report: Isotope Production and Distribution Program for Isotopes in the U.S.
Index of Isotope Production and Distribution - Isotopes: Oak Ridge site for stable isotopes primarily.

Misc.

ATOMIC MASS DATA CENTER: International Center for Atomic Mass Information.
IAA Home Page level densities Nuclear Level densities for astrophysics.
NUCLEAR DATA AND MEASUREMENT REPORTS: Technical reports from Argonne National Laboratory on Nuclear Measurements and Methods
Physics Analysis Workstation - PAW: CERN site for PAW related topics.
Radiation Safety Information Computational Center: A variety of useful programs for nuclear research, nuclear evaluation and nuclear shielding needs.
SUPERSATURATED ENVIRONMENTS: Cloud Chamber Demonstrations A good site for checking into cloud chamber demostrations.
International Nuclear Target Development Society (INTDS) bibliography A good site for checking into target fabrication.